PD17012_15 Datasheet, PDF (165/320 Pages) Renesas Technology Corp – 4-BIT SINGLE-CHIP MICROCONTROLLERS WITH DIGITAL TUNING SYSTEM HARDWARE

µPD17012, 17P012
14.4.5 Relationship of output waveform and each pin of D/A converter
(1) shows the relationship between the output waveform and duty factor. (2) shows the relationship of the
output waveform of each pin.
(1) Duty factor and output waveform
x=0
x=1
x=2
888 ns
222 ns
888 ns
x = 255
227.6 µs
666 ns
(2) Output waveform of each pin
PWM1
(x = 0)
PWM0
(x = 0)
222 ns
227.6 µs
14.5 Cautions on Using D/A Converter
(1) The initial PWM output setting following the power on application is made in the following procedure. This
is because the PWM data register is undefined so that data should be set beforehand.
<1> Set the value of PWM data register
<2> Set the PWMnSEL flag
(2) Do not overwrite the data of PWM data register during PWM operation. The output of the correct duty for one
cycle (227.6 µs) cannot be obtained.
Data Sheet U10101EJ4V0DS
163